AT6101C, AT6101CM Spectrometers

AT6101C Spectrometer is designed for detection of radioactive sources and is an efficient tool for prevention of radiological terrorist threats and other unauthorized activities like illicit storage, use, transfer and traffic of radioactive substances and materials. Can also be used for radiation monitoring of areas, routes, isolated grounds, industrial sites and buildings with GPS-referencing of measurement data.
The spectrometer can comprise the following detection units:
▪BDKG-11M / BDKG-19M Spectrometric gamma radiation detection unit (basic version)
▪BDKN-05 Neutron radiation detection unit (option).
▪BDKG-04 Wide-range dosimetric gamma radiation detection unit (option).
In cases when higher spectrometer sensitivity to gamma radiation is required BDKN-05 detection unit can be replaced by additional BDKG-11M (BDKG-19M) detection unit (option).
The spectrometer can be delivered in a backpack (basic version) or in a sealed shock-proof case (option).


Operating principle

As a control and indication device the handheld computer (HPC) is used. Data transfer from detection units to HPC is carried out via Bluetooth. Data transfer by cable is carried out in the places where transfer via radiochannel is impossible or undesirable.
The spectrometer operates in continuous radiation environment scan mode: continuous search, detection, localization and identification of gamma radiation sources; search and detection of neutron radiation sources. When radioactive source is detected the spectrometer activates alarm and identifies its radionuclide composition.
Types of identified radionuclides are displayed on HPC screen and operator hears a corresponding voice message in a wireless headset.
Measurement results are continuously transmitted into HPC for subsequent processing by PC and can be plotted onto a map using application software tools.




▪ Radioactive substances and materials traffic control
▪ Radioactive contamination monitoring of areas by mobile tools
▪ Public events radiation safety contro
▪ Radiation protective measures in case of nuclear disasters
▪ Radiation monitoring of facilities and sites
▪ Dosimetric and spectrometric survey of ground and facilities, radioactive mapping

Key users

▪ Organizations for nuclear energy use control
▪ Security service
▪ Customs service
▪ Border control service
▪ Radiation monitoring service
▪ Emergency rescue squads

▪ Automatic simultaneous gamma-neutron radiation scanning
▪ Search, detection and localization of radioactive source and real-time identification of its isotopic composition
▪ Automatic accommodation to radiation background level change
▪ Dose rate measurement range can be expanded to 10 Sv/h
▪ Simultaneous measurement of gamma radiation spectral distribution and dose rate
▪ Scanning data are constantly recorded for further analysis
▪ Measurement results can be tied to a location (GPS function)
▪ “GARM” application software for further data processing and analysis in expert mode
▪ “ARMS” application software (option) for automatic data transfer to a remote server (Over FTP server and if HPC has a 3G communication function or can be connected to a Wi-Fi network)
▪ 20 hours of operation time
▪ 130 hours memory capacity
▪ Minimum weight in its class






BDKG-11M (1 / 2 pcs.)

BDKG-19M (1 / 2 pcs.)

Gamma radiation detector


NaI(Tl) Ø63x63 mm


NaI(Tl) Ø63x160 mm

Energy range


In Spectrometric mode

20 keV...3 MeV

In Dosimetric mode

50 keV...3 MeV

Ambient gamma radiation dose equivalent rate measurement range

0.01...150 µSv/h

0.01...50 µSv/h

Intrinsic relative error of dose rate measurement

±20% max.

Sensitivity to gamma radiation, not less




13500 (27000)*

37000 (74000)*


2200 (4400)*

6000 (12000)*


1200 (2400)*

2500 (5000)*

Radionuclide identification

Medical, Industrial, Natural, Bremsstrahlung (Individual order: Library of identified radionuclides can be corrected)

Minimal detectable level of gamma radiation dose rate from a source, moving at 0.5 m/s


0.05 µSv/h (0.035 µSv/h)*


0.03 µSv/h (0.02 µSv/h)*

Minimal activity of 137Cs source, detectable at the distance of 1 m in a time ≤2 s. 95% probability of source detection with false alarm frequency not above 1 in 10 minutes


(450±10) kBq


(300±10) kBq

Alarm response time

<2 s

Typical resolution at 662 keV (137Cs)



Number of ADC channels



Maximum input statistical load

105 s-1 (≥2·105 s-1)*

105 s-1 (≥2·105 s-1)*

* Configuration with two BDKG-11M (BDKG-19M) detection units




Additional accessory for expanding dose rate measurement range of X-ray and gamma radiation (Up to 10 Sv/h)


BDKN-05 **

Neutron radiation detector

2 proportional counters 3He Ø30x360mm in a polyethylene moderator

Energy range

0.025 eV...14 MeV

Sensitivity to 252Cf neutron radiation

20 cm2

Minimal activity of Pu-Be source, detectable at the distance of 1.25 m in a time ≤3 s. 95% probability of source detection with false alarm frequency not above 1 in 60 minutes

(5±1.25)∙104 neutron/s

** Not available for configuration with two BDKG-11M /BDKG-19M detection units

Other parameters and operating conditions


GPS-receiver, integrated into HPC. Positioning accuracy ≥3 m

Burn-up life

100 Sv

Protection class


backpack version


shock-proof case version


Continuous run time

~20 h

Working temperature range


Relative humidity

95% (with air temperature ≤35°C without condensation)

Overall dimensions



backpack version

450x330x250 mm

500x330x250 mm

shock-proof case version

625x500x300 mm

625x500x300 mm




backpack version

7 kg

8.5 kg

shock-proof case version

17 kg

18.5 kg

*** Configuration with BDKG-11M /BDKG-19M, BDKG-04 and BDKN-05 detection units

Design and specifications are subject to change without notice


Spectrometers meet IAEA requirements (technical and functional specifications for border monitoring equipment); ANSI 42.43 standard requirements;

Safety standard requirements: IEC 61010-1:2001; EMC requirements: EN 55011:2009, IEC 61000-4-2:2008, IEC 61000-4-3:2008.

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